objective c - Obteniendo el último día de un mes

objective-c cocoa-touch

Question

¿Cómo puedo obtener el último día del mes actual como NSDate ?

Answer 1

Versión Swift

extension NSDate {
func lastDayOfMonth() -> NSDate {
let calendar = NSCalendar.currentCalendar()
let dayRange = calendar.rangeOfUnit(.Day, inUnit: .Month, forDate: self)
let dayCount = dayRange.length
let comp = calendar.components([.Year, .Month, .Day], fromDate: self)
comp.day = dayCount
return calendar.dateFromComponents(comp)!
}
}

Answer 2

Con Swift 3 y iOS 10, la forma más fácil que encontré para hacerlo es Calendar dateInterval(of:for:) :

func monthInterval() -> DateInterval? {
let calendar = Calendar.current
guard let interval = calendar.dateInterval(of: .month, for: Date()) else { return nil }
let duration = interval.duration
// Subtract one second because dateInterval(of:for:)''s end date returns the beginning of the following month
return DateInterval(start: interval.start, duration: duration - 1)
}
guard let interval = monthInterval() else { return }

Luego puede usar interval.start e interval.end para obtener las fechas que necesita.

Answer 3

Función de solución:

-(int)GetLastDayOfMonth:(NSDate *)date
{
int last_day = 27;
NSCalendar *cal=[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *compsMonth = [cal components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:date];
[compsMonth setDay:last_day];
int month = [compsMonth month];
while(TRUE){
[compsMonth setDay:last_day+1];
NSDate *dateFuture = [cal dateFromComponents:compsMonth];
NSDateComponents *futureComps = [cal components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:dateFuture];
if(month != [futureComps month]){
return last_day;
}
last_day+=1;
}
return last_day;
}

Answer 4

Pon esto en una categoría:

-(NSDate*)lastDayOfMonth
{
NSInteger dayCount = [self numberOfDaysInMonthCount];
NSDateComponents *comp = [[self calendar] components:
NSCalendarUnitYear |
NSCalendarUnitMonth |
NSCalendarUnitDay fromDate:self];
[comp setDay:dayCount];
return [[self calendar] dateFromComponents:comp];
}
-(NSInteger)numberOfDaysInMonthCount
{
NSRange dayRange = [[self calendar] rangeOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitMonth
forDate:self];
return dayRange.length;
}
-(NSCalendar*)calendar
{
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
[calendar setTimeZone:[NSTimeZone timeZoneWithName:TIMEZONE]];
return calendar;
}

Answer 5

Versión de Swift 3.0.1

extension Date {
func lastDayOfMonth() -> Date {
let calendar = NSCalendar.current
let dayRange = calendar.range(of: .day, in: .month, for: self)
let dayCount = dayRange?.count
var comp = calendar.dateComponents([.year, .month, .day], from: self)
comp.day = dayCount
return calendar.date(from: comp)!
}
}

Answer 6

Versión de iOS 7

solo para deshacerse de las desaprobaciones ... con una pequeña adición para obtener el último segundo del día.

 // current date
NSDate *now = [NSDate new];
// get last day of the current month
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
[calendar setTimeZone:[NSTimeZone systemTimeZone]];
NSRange dayRange = [ calendar rangeOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitMonth
forDate:now];
NSInteger numberOfDaysInCurrentMonth = dayRange.length;
NSDateComponents *comp = [calendar components:
NSCalendarUnitYear |
NSCalendarUnitMonth |
NSCalendarUnitDay fromDate:now];
comp.day = numberOfDaysInCurrentMonth;
comp.hour = 24;
comp.minute = 0;
comp.second = 0;
NSDate *endOfMonth = [calendar dateFromComponents:comp];

Answer 7

// Adapted from running code in my app
NSDate *curDate = [NSDate date];
NSCalendar *currentCalendar = [NSCalendar currentCalendar];
NSRange daysRange =
[currentCalendar
rangeOfUnit:NSDayCalendarUnit
inUnit:NSMonthCalendarUnit
forDate:curDate];
// daysRange.length will contain the number of the last day
// of the month containing curDate
NSLog(@"%i", daysRange.length);

Answer 8

NSDate *curDate = [NSDate date];
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* comps = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSWeekdayCalendarUnit fromDate:curDate]; // Get necessary date components
// set last of month
[comps setMonth:[comps month]+1];
[comps setDay:0];
NSDate *tDateMonth = [calendar dateFromComponents:comps];
NSLog(@"%@", tDateMonth);

también debería funcionar